JPH0386635U - - Google Patents
Info
- Publication number
- JPH0386635U JPH0386635U JP14774589U JP14774589U JPH0386635U JP H0386635 U JPH0386635 U JP H0386635U JP 14774589 U JP14774589 U JP 14774589U JP 14774589 U JP14774589 U JP 14774589U JP H0386635 U JPH0386635 U JP H0386635U
- Authority
- JP
- Japan
- Prior art keywords
- phase
- division ratio
- frequency division
- output
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims 2
- 230000010355 oscillation Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
第１図はこの考案の一実施例の構成を示すブロ
ツク図。第２図はこの考案の一実施例の作用の説
明に供するタイミング図。第３図はこの考案の一
実施例の変形例の一部を示すブロツク図。
１……電圧制御発振器、２，１１および１８…
…分周器、３……位相比較器、４……ループフイ
ルタ、１０……位相差検出回路、１７……誤動作
防止回路。
FIG. 1 is a block diagram showing the configuration of an embodiment of this invention. FIG. 2 is a timing diagram for explaining the operation of one embodiment of this invention. FIG. 3 is a block diagram showing a part of a modification of one embodiment of this invention. 1... Voltage controlled oscillator, 2, 11 and 18...
... Frequency divider, 3 ... Phase comparator, 4 ... Loop filter, 10 ... Phase difference detection circuit, 17 ... Malfunction prevention circuit.
Claims (1)
または分周比ｎから所定値増減した分周比に切換
えられて電圧制御発振器の発振出力の周波数を分
周する分周器と、分周器からの出力と入力信号と
の位相比較をする位相比較器と、位相比較出力を
入力とし、かつ出力により電圧制御発振器の発振
周波数を制御するループフイルタと、位相比較器
の位相比較入力間の位相差が所定範囲以内か所定
範囲外かを検出する位相差検出手段とを備え、前
記位相差が所定範囲以内であるときの位相差検出
手段の出力により分周器の分周比を分周比ｎに、
所定範囲外のときの位相差検出手段の出力により
所定範囲以内からはずれる方向に伴つて分周器の
分周比を分周比ｎから所定値だけ増加または減少
されるようにしたことを特徴とする位相同期回路
。 A voltage controlled oscillator and selectively a frequency division ratio of n
Or a frequency divider that divides the frequency of the oscillation output of the voltage controlled oscillator by switching to a frequency division ratio that is increased or decreased by a predetermined value from the frequency division ratio n, and a phase that compares the phase of the output from the frequency divider and the input signal. A comparator, a loop filter that receives the phase comparison output as an input and controls the oscillation frequency of the voltage controlled oscillator by its output, and detects whether the phase difference between the phase comparison input of the phase comparator is within a predetermined range or outside a predetermined range. a phase difference detection means, the frequency division ratio of the frequency divider is set to a frequency division ratio n based on the output of the phase difference detection means when the phase difference is within a predetermined range;
The frequency division ratio of the frequency divider is increased or decreased by a predetermined value from the frequency division ratio n as the output of the phase difference detection means is outside the predetermined range. phase-locked circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14774589U JPH0386635U (en) | 1989-12-25 | 1989-12-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14774589U JPH0386635U (en) | 1989-12-25 | 1989-12-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0386635U true JPH0386635U (en) | 1991-09-02 |
Family
ID=31694248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14774589U Pending JPH0386635U (en) | 1989-12-25 | 1989-12-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0386635U (en) |
-
1989
- 1989-12-25 JP JP14774589U patent/JPH0386635U/ja active Pending
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